I think you are doing everything just right! And I especially agree about telling them the truth....rather they heard it from you then rumors later on.
You've protected them from day one and are a teriffic momcat..*grin

Now you just need to figure out what to do with the rest of your life..and you are entitled to have a life..you've paid your dues dear lady and one of your rewards are two splendid girls. You are blessed...believe it or not.